From c2834070a29e30771635d366ba8136bb582d3c68 Mon Sep 17 00:00:00 2001
From: fd7794 <mathis.peuster@web.de>
Date: Tue, 6 Feb 2024 11:41:03 +0100
Subject: [PATCH] added check for x for simplify_exponential_function

---
 src/main/py/read_math_function.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/py/read_math_function.py b/src/main/py/read_math_function.py
index be726a5..a1d3868 100644
--- a/src/main/py/read_math_function.py
+++ b/src/main/py/read_math_function.py
@@ -75,4 +75,6 @@ def extract_constant(function):
 
 def simplify_exponential_function(type, function):
     if type != "e":
-        return False
\ No newline at end of file
+        return False
+    if 'x' not in function:
+        return "Der Ausdruck muss die Variable 'x' enthalten."
\ No newline at end of file